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线性调频连续波(LFMCW)信号应用于机载虚拟阵多输入多输出(MIMO)雷达体制。二者的结合,一方面,可在较少阵元条件下,获得虚拟的宽口径,改善雷达的测角性能;另一方面,采用连续波体制,在相同峰值发射功率的条件下,可增大雷达的探测距离,弥补MIMO雷达宽波束发射导致的威力下降。LFMCW信号的匹配滤波输出拖尾较长,文中对由此产生的杂波距离旁瓣泄漏问题进行了建模与分析,结果表明:LFMCW雷达系统与线性调频脉冲雷达系统具有相似的杂波距离旁瓣泄漏特性,数值仿真验证了此结果的正确性。另外,非自适应处理的仿真结果也表明对高速、小RCS的目标,LFMCW信号具有更高的输出信杂噪比。
Linear Frequency Modulated Continuous Wave (LFMCW) signals are applied to the airborne virtual array multiple input multiple output (MIMO) radar system. On the one hand, the virtual wide aperture can be obtained under the condition of fewer array elements and the goniometric performance of the radar can be improved; on the other hand, the continuous wave system can be used under the same peak transmitting power The detection range of a large radar, to make up for the reduced power caused by wide beam emission MIMO radar. LFMCW signal matching filter output trailing a long tail, the resulting noise and sidelobe leakage problem was modeled and analyzed, the results show that: LFMCW radar system and the linear frequency modulated pulse radar system has a similar clutter distance The valve leakage characteristics and numerical simulation verify the correctness of this result. In addition, the simulation results of non-adaptive processing also show that the LFMCW signal has a higher output signal-to-noise ratio for high-speed, small RCS targets.